Category: Optics

The Discovery of Pulsar Stars

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Neutron stars were thought to be preposterous when first suggested until 1967 when scientists used radio-antenna telescopes to map the universe. 3 pulses would be unusual, 4 pulses would be phenomenal, but scientists had received pulses from certain parts of the universe 24 hours per day, 7 days per week for months on end. The reason the pulses occurred was because every rotation of the neutron star causes energy to swipe past Earth exactly how light from a lighthouse sweeps light onto the oceans. Scientists first thought the pulses were from aliens until they proposed that the new star had to be denser than any type previously discovered, being the size of a planet but with the power of a star. Astronomers named these new stars “pulsars” and investigated continuously until 1 year later when they found a pulsar, burried deep within the remains of a super local, the pulsar known as the “Crab Pulsar” which is the closest pulsar to Earth. Interestingly, Swiss astronomer Fritz Zwicky had mathematically proven this phenomena 80 years prior but was labeled a hack for his wild theories

The First Assassination With a Firearm

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The first assassination using a firearm was of James Stewart the Earl of Moray, in 1570, who was assassinated by James Hamilton. Hamilton stalked Stewart for weeks, following him from Perth, Scotland to Stirling, Scotland, and finally pouncing when in Linlithgow, Scotland. Hamilton was well prepared, hanging a black cloth textile behind him so that his shadow could not been seen upon the street and putting down bird feathers to muffle the sound of his movements. As Stewart rode by, Hamilton raised up his weapon, a short barreled hunting carbine, and fired, hitting Stewart in the stomach. This shot caused much confusion but by the time Stewart and his entourage had figured out what occurred, Hamilton was long gone, as his escape route was pre-planned. Stewart managed to stumble to the home he was staying but died later that same evening. Hamilton was never caught for this crime but the entire act is immortalized in stained glass at Saint Giles’ Cathedral in Edinburgh, Scotland. This assassination caused chaos in Scotland and made the English court immensely nervous as bodyguards were no match for a distant assassin within the shadows who could pick off their target and vanish without a trace. Firearms were deemed during this era a threat to national security in Europe, especially after the advent of the wheel lock mechanism in 1515 which was a mechanized method of igniting gunpowder, allowing for the design of the pistol to work in practice for the very first time

The Color of Ancient Egyptian Pharaoh Cleopatra’s Skin

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Cleopatra VII, the last ruler of Ptolemaic Egypt, was of Macedonian descent, which makes her Greek, as her family was established by Ptolemy I, a soldier who later became a General within Alexander III’s military force, a person more commonly referred to as “Alexander the Great”. The Ptolemies practiced interfamily marriage, meaning siblings, or more uncommonly cousins etc., as Cleopatra herself married her brother, therefore her ancestry was predominantly Greek. The caveat to this is that the identity of Cleopatra’s mother is unclear, leaving a lot of room for speculation of potential Egyptian as well as other African or regional influences. As for her skin color specifically, historical depictions and recorded texts do not provide clear evidence, but based upon her Greek heritage, she likely had a light olive complexion, common in persons of Mediterranean lineage during the modern day. Cleopatra’s exact skin tone however remains uncertain without genetic evidence as her remains have never been identified and/or located

The Reason Mercury’s Orbit Around the Sun Appears Retrograde From Earth

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Albert Einstein’s Theory of Relativity can be proven because of how Mercury orbits the Sun. Isaac Newton correctly explained how and why planets orbit the Sun, but because Mercury is so close to the Sun, it orbited its center star 7% faster than it should have therefore Mercury is close enough to the Sun that its space-time path is warped because of the mass of the Sun and this warping causes Mercury to orbit faster than planets further away. For many decades scientists hypothesized there was another planet, unseen yet, which gave Mercury an extra push. This additional planet was prematurely named “Vulcan”, which was in vain because no such planet ever existed. It was also theorized that cosmological dust gave Mercury its extra boost or that an unseen asteroid or asteroid field was helping Mercury along. It wasn’t until Albert Einstein proposed that all matter cuts through both space and time, following a curve, that the catalyst could be definitively proven. If a sphere rolled along a table and suddenly hit a dip, it would speed up and change its trajectory. This is essentially what occurs within space-time and is the reason Isaac Newton’s Universal Laws of Gravitation don’t quite fit with Mercury. Mercury is close enough to the Sun that its space-time path is warped because of the mass of the Sun and this warping causes Mercury to orbit faster than planets further away. It is not only Mercury which does this; any planet or body near its host star will orbit slightly faster than planets or bodies further away. Although it is impossible to visually see the curvature and bending of space-time, it can be definitively proven because of the way large bodies of matter affect smaller bodies of matter due to the mass of each body

The Problem With Super Massive Black Holes

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Super massive black holes have a fundamental problem in that not enough time has passed since the creation of the universe to account for their massive size. This acute time crunch is because the universe has a finite value of only 13,700,000,000 (13.7 billion) years. It is theorized that the reason super massive black holes can become larger than what time permits is because they have a colossal head start due to the fact that they may be birthed directly from a cloud of gas, a phenomena referred to as “direct collapse”. These molecular clouds collapse under their own gravity, and as they collapse, fragmentation occurs as more densely packed areas collapse more quickly. Nuclear fusion begins next and a star is thus created. If a giant gas cloud collapses without making a star, it would form a gas disc instead, allowing the mass to flow into the center very rapidly, creating a black hole instead which is essentially a vortex upon an immense scale

Scientists Who Studied the Sun by Looking Directly at it

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Thomas Harriot observed sunspots in 1610 but did not publish his work. In 1612 Harriot recorded that after having viewed the sun, his sight was “dim for an hour”. Oxford University astronomer John Greaves is quoted as stating that after sun observations, he would see afterimages which looked like a flock of crows within his field of vision. Sir Isaac Newton attempted to look at the sun in a mirror, which blinded him for 3 days and caused him to experience afterimages for months

The Causation of the Colors of the Aurora Borealis

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The colors of the aurora borealis are layered with violet at the bottom, green in the middle, and red at the top, which signifies the structure of the atmosphere. Just as different chemicals create different colored flames (e.g. propane always producing a blue flame etc.), so too do photons bouncing around in the atmosphere off of different elements present. Nitrogen glows violet in a band at the bottom and oxygen glows green and red, creating a curtain 400 kilometers in length

The Period When Classical Artwork Transitioned From 2 Dimensions (2D) to 3 Dimensions (3D)

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Art broke away from being two dimensional caricatures with the invention of the camera obscura which had the painter sit in a dark room, with the window blocked out with a small hole in it. Doing so would cause the image outside the window to be projected into the room of the painter and onto the canvas, which could then be traced. The image, as with cameras and the human brain is brought in upside down, so the painter would be forced to trace upside down. During the Tudor period, lenses were developed for the first time which allowed artists to learn to paint with realism because after tracing and creating the minute details of each face correctly, they could focus on light and shadow. The camera obscura acted as a starting point to stencil a face. Boards were put down the back of the person sitting so that they would sit perfectly still allowing the painter to sketch them in perfect render. This technology acted effectively the first camera and in that, the first glimmer of Renaissance artwork

The First Person to Theorize How Stars are Situated Within the Universe

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Prior to the 16th century, it was believed that the Earth was the center of the universe with a belt of stars which rotated around it, exactly the same way in which planets orbit the central star of any solar system. These stars were believed to be fixed in their position as the constellations observed upon Earth do not alter greatly in their position or intensity in terms of what the human eye can perceive. Thomas Digges was the first person to propose that the stars are placed at different distances and in different positions, not in a ring of stars which stayed fixated, but rather in an infinite universe as distant points of light. Digges built upon the work of Nicolaus Copernicus by changing Copernicus’ original visual sketch of the planets and their orbital paths in that he removed the stellarum fixarum meaning “fixed stars” in Latin, and built a model in which stars were completely different in their distance relative to the Earth, with brightness controlled by how far or close a particular star was in proximity

The Difference between QR Codes and Bar Codes

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The primary difference between QR code’s and barcodes is that a barcode must be read horizontally, has a maximum storage capacity of 12 – 43 characters (e.g. universal product code etc.), and can store data in one dimension, whilst a QR code is capable of being read horizontally and vertically, has a maximum storage capacity of 4000 – 7089 characters, and can store data in two dimensions as a matrix bar code. Additionally, a QR code can be 10x smaller than a bar code and still be legible and a QR code can be read if damaged or parts missing. The term “QR code” is an abbreviation for “quick response code”